Engine-starting device for motor-cycles.



F. S. ELLETT.

ENGINE STARTING DEVICE FOR MOTOR CYCLES.

APPLICATION FILED APR.27| 1914.

Patented June 1, 1915.

, l mu. n V a therein.

' i rnnnnnicx setters, or nnmxna, new Young i hi remn-sran'rms matron roa mo'ronpcv'cnns.

of Elmira; county of Chemung, State of New York, have invented certan new and useful Improvements. in Engine-Starting Devices for Motor-Cycles, of, which the following is a specification.

This invention relates to motorcycles and more particularly to improvements in engine starting devices therefor. a

One of the ob'ects of the invention is to provide asimpe device for this purpose which is applicable to the standard makes of. motorcycles. without material changes Another objectj is provide an engine starting device includinga traveling nut,

. the parts being so constructed that there is v 20 no possibilityof the nut becoming wedged. Other objects and the features of novelty .7 will be apparent from the following description taken in connection with the vac-.

companying drawings, in which,

Figure 1 is an elevation of a part of a motorcycle frame and the usual counter shaft wheels, certain parts being shown in section; Fig. 2 i-sa composite view, partly in elevation and partly in section of the traveling nut; Fig. 3-is an end elevationof the nut; Fig. 4 is a composite view. partly in section and partly in elevation, .of' a threaded sleeve for the pedal shaft; Fig.5

is an end elevation, of the Same;

Referring to the drawings'lo indicates a- 7 portion of the motorcycle frame; which acts as a supporting member for the sprocket .wheels' 11 and 12, these wheels being rotatably mounted on the frame. A shaft13 is journaled in. the supporting member andis coaxially arranged with respect to wheels 11 and 12, this shaft ha-ving: thereon the crank arms 14.- and 15 to which the usual,

pedals are attached.

The shaft 13 isprovided. at one end with a shoulder16 having a plurality of axially extending slots 17 therein. In the drawings- I have indicated a construction in which vided with a series of. rectangular axially Pr je tin qleti h i 11 I Specification of Letters Patent. Application ina April 27, 1914.. semi No. 834,766.

I jaws and 23;.-

Patented une'i, 1915.

Between the sprocket- 11 and theishoulder 16 is arranged a triple threaded sleeve 20 on which is arranged a nut 21. The sleeve 20 has axial projections 22 which engage the slots 17 and it will be observed that the thread spaces on the sleeve register with the axially extending sides of the slots 17 i so that the ends 21 of the internal threads of thenut 21 will abut these sides when the nut is at'the limiting position toward the left and thereby revent the nut from wedgmg against the s oulder 16.

, The nut 21 is provided with axiallyex.

tending rectangular clutch jaws 23 which are adapted to coiiperated with the jaws 19 to form a driving connection. between the nut 21 and the sprocket 11.

I In order to limit the movement of the nut 21 toward the right, on thesleeve 20, and

thereby vprevent thrust in axial direction between the nut and-the. threaded ring 18, the thread spaces onlthe sleeve do not extend to the right end of the sleeve, being stopped. as at 24 so that the ends 22" of the internal threads on the nut 21 will engage the ends 24 of the thread spaces- This construction prevents any Wedging of the nut 21 when it is moved toward the right to effect an engagement of the teeth 19 and 23. A retarding device 25 in the-form of a spring is connected atone end to the ring 26 and extends around and in contact with the hub portion 27 of thenut 21.

--I1i=ordfer to permit thenut 21 toturn on the sleeve 20 when the adjacent endsof the jaws 19 and 23 engage, the shaft 13 is arrangedto be axially movable. A spring 28 surrounds the shaft 13 and normally presses the shaft toward the right in Fig. 1. and

when the jaws 19' and 23 are in endwise en- 'gagement' -the turning of the sleeve 20 in the nut 21 draws the shaft 13 toward the left and compresses the spring 28. When the ends of the internal threads of the nut 21" and efi'ect a, driving connection between the I The engine of the motorcycle is usually geared to the sprocket .1 1 ,by means of a suitable chain and therefore-the engine ma,

be started by. rotating the sprocket 11.

with the parts stationary, the shaft 13 is given right-hand rotation,- as seen from the right hand end of vFig. l, the nut QL-will be carried toward the right on the sleeve 20 on vaccount of being held by the retarding ring 25. When the ends of the jaws 19 and 23 engage, the shaft 13 will be moved endwise, as above described, until the ends 24 carry the sprocket 11 with it andthus -rotate the engine shaft. After the engine startsfand when the sprocket 11 attains a speed greater than that atflwhich the shaft 13 is being rotated, the nut 21 will be car* 'ried toward the left'on the sleeve 20 and thus disengage the jaws 19 and 23, thereby permitting the engine to run independentlyof the shaft 13,

It will be understoodthat changes may .bemade in thedetails of construction and that the form of the invention shown is merely illustrative of the principles-of my invention, the invention being defined in the appended claims.

Having described my invention what I claim and desire to secure by Letters-Patwheel rotatable thereon, a rotatable shaft (mt is, 1. In a device of the class described, the combination of a supporting member, a

having a screwthereo a nut on said screw having clutch teeth, cooperating teeth carried by said wheel, retarding means for said nut permitting said screw to be rotated relative to the nut, and means limiting the relative movement of said screw. and nut so as to "man axial directio'nwhen said teeth-are prevent thrust between said wheel and nut in driving engagement. w 2. In a device of the class described, the combination of a supporting member, a wheel rotatable thereon, a rotatable shaft coaxial with said wheel and having a screw thereon, a nut on said screw having clutch teeth, means for holding said nut to permit said screw to be rotated relatively thereto, cooperating teeth carried by said wheel adapted to engage with the teeth on said nut when the nut moves in an axial direction, said screw and said nut having cooperating parts adapted to limit the axial movement of the nut so as to prevent thrust betweensaid wheel and nut in an axial die. In an device of the class described, the

,. combination of a supporting member, a

wheel rotatable thereon, a rotatable shaft coaxial with said wheel and having a screw thereon, a nut on-said screw having clutch teeth, means for holding said nut to perm'it said screw to be rotated relatively thereto, cooperating teeth carried by said wheel adapted to engage with the teeth on said nut when the nut is moved in an axial direction, said screw and said nut having their intera nut on said screw having teeth adaptcdto engage with the teeth on said wheel, retard .90

ing means for holding said nut to permit engaging threads so formed as to limit the v sald screw. to be rotated relatively thereto,

spring means adapted to move said, shaft in ,one 1 gagement of said teeth, said spring means ,being also adapted to permit saidshaftto move axially in the opposite direction,

whereby said nut may continue to turn on said .screw when said teeth are'in endwise rection axially-to effect the interen-- engagement, and means whereby said'nut is rotated relatively to said wheel.

5. In a device of the class described, the combination of [a supporting member, a wheel rotatable thereon and provided with a series of clutch teeth,pa rotatable axially movable shaft coaxial with said wheel and having a screw thereoma nuton saidscrew having teeth adapted to engage with the teeth on said wheel, retarding means for holding said nut to permit said screw to be rotated relatively thereto, spring. means pressin 'adapte to permit the shaftto move axially iii the opposite direction whereby said nut may continue to turn on said screw when said teeth are inendwise engagement, and means whereby said nut is rotated relatively to said wheel. ,1 v I,

6. In a device of the class described, the combination j of a supporting member, a rotatable shaft, carried thereby, having a slotted shoulder, a threaded sleeve on said shaft and having projections en aging the slots in said shoulder, the threa spaces on said sleeve registering with axially extending sides of said slots, as and forthepurpose described. Y Y a 7. In a device of the class described, the combination of a support ng member, a

7 85 Y rotatable and axially movable'shaft coaxial with said wheel and "having a screw thereon,

rotatable shaft, carriedthe'reby, having a In testimon whereof I affix my signature shoukller providecli glare; alxielly extend in presence 0 two witnesses.

in s ots a tri ere e s eeve on sai shz ift having axial projections en aging said B REDLRICK ELLETT' 5 slots, the thread spaces on said eeve regis- Witnesses:

tering with axially exten sides of said. ELMER A. BRACE,

slots, as and forthe purpose escribed. THEO. C. SAYLES. 

